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An aeroplane flying horizontally 1 km...

An aeroplane flying horizontally 1 km above the ground is observed at an elevation of `60o` . After 10 seconds, its elevation is observed to be `30o` . Find the speed of the aeroplane in km/hr.

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The correct Answer is:
415.67 km / hr
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ICSE-HEIGHTS AND DISTANCES -Exercise 22 B
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